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1. unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity.
2.ordinary watches are used to know the time . but in ordinary watches time keeps moving and cannot be restartedused to count the time . a stopwatches is different from the other watches because the time in stopwatches starts from 00.00 and can be reset .
3.Pendulum swings in to and for motion in a precise time interval dependent on its length, and resists swinging at other rates. Therefore clock makers use it due to its accuracy rate.
4.The period of a simple pendulum is T=2π√Lg T = 2 π L g , where L is the length of the string and g is the acceleration due to gravity.
5. Oscillation is defined as the process of repeating variations of any quantity or measure about its equilibrium value in time. Oscillation can also be defined as a periodic variation of a matter between two values or about its central value.
6. A body is said to be in uniform motion only when the body is travelling in a straight line.
7. 100 CM =1 m
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